From Wikipedia

The Sukhoi Su-25 NATO reporting name: Frogfoot is a single-seat, twin-engine jet aircraft developed in the Soviet Union by Sukhoi. It was designed to provide close air support for the Soviet Ground Forces. The first prototype made its maiden flight on 22 February 1975. After testing, the aircraft went into series production in 1978 at Tbilisi in the Georgian Soviet Socialist Republic.

Early variants included the Su-25UB two-seat trainer, the Su-25BM for target-towing, and the Su-25K for export customers. Some aircraft were being upgraded to Su-25SM standard in 2012. The Su-25T and the Su-25TM (also known as the Su-39) were further developments, not produced in significant numbers. The Su-25, and the Su-34, were the only armoured, fixed-wing aircraft in production in 2007. Su-25s are in service with Russia, other CIS members, and export customers.

One of the latest in Mushroom Model Publications’ White Series, Finnish & German Seaplane Colours, Finland 1939-1945 follows up an earlier volume on Finnish aircraft: (2018’s Finnish Jet Colours; 2018’s Finnish Bomber Colours, 1939-1945; 2015’s Finnish Fighter Colours, 1939-1945, Volume 2; and 2014’s Finnish Fighter Colours, 1939-1945, Volume 1). MMP is calling this book part of their "Rainbow Series." I'm guessing that refers to their large format camouflage and markings set of books in their "White" series that have addressed Bulgaria, Finland, Hungarian, Poland, Portugal, Romania, Russia, and Sweden. This series seems to share a commonality of discussing the specific topic of the evolution of a countries' evolution in markings. To that end, this book utilizes many previously un-published pictures and focuses in on individual aircraft to supplement with superb color illustrations.

From the Publisher

One of the few books that explores what British and Commonwealth forces knew about the dreaded Panther tank and how to destroy it using previously unpublished documentation. An excellent reference book for military modelers, historians and tank wargamers (War Thunder/World of Tanks) interested in the iconic Panther with authentic camouflage suggestions. Three chapters cover the design and development of the Panzer V Panther tank.

The first book to list all surviving Panther tanks, provide photographs, and give their current location

Using only original official period documents from the Second World War, How to Kill a Panther Tank: Unpublished Scientific Reports from the Second World War provides the reader with the same information on the Panzer V Panther that was available to British and Commonwealth senior officers/tank crews during the war.